Organized at Camp Butler, Ill., August 10, 1861. At Jacksonville, Ill., till September 1. Moved to Cairo, Ill., September 1, and duty there till March, 1862. Attached to District of Cairo to February, 1862. 1st Brigade, 1st Division, District of Cairo, February, 1862. Flotilla Brigade, Army of the Mississippi, to April, 1862. 1st Brigade, 1st Division, Army of the Mississippi, to September, 1862. 1st Brigade, 13th Division, Army of the Ohio, to November, 1862. 3rd Brigade, 3rd Division, Right Wing 14th Army Corps, Army of the Cumberland, to January, 1863. 3rd Brigade, 3rd Division, 20th Army Corps, Army of the Cumberland, to October, 1863. 3rd Brigade, 2nd Division, 4th Army Corps, to August, 1864.
SERVICE - Expedition to Belmont, Mo., November 6-7, 1861. Battle of Belmont November 7. Expedition into Kentucky January 16-21, 1862. Occupation of Columbus, Ky., March 3. Skirmish at Columbus March 4. Operations against New Madrid and Island No. 10 March 14-April 8. Actions at Island No. 10 March 15-16 and 25. Expedition to Union City, Tenn., March 30-April 2. Union City March 30-31. Action and capture at Tiptonville April 8. Expedition to Fort Pillow, Tenn., April 13-17. Moved to Pittsburg Landing, Tenn., April 17-23. Advance on and siege of Corinth, Miss., April 29-May 30. Action at Farmington May 3. Reconnoissance toward Corinth May 8. Action at Farmington May 9. Pursuit to Booneville May 30-June 12. Tuscumbia Creek May 31-June 1. Reconnoissance toward Baldwyn June 3. Camp at Corinth till July 21. Moved to Iuka, Miss., thence to Courtland, Ala., and duty along Memphis & Charleston R. R. till September 3. March to Nashville, Tenn., September 3-12. Siege of Nashville September 12-November 6. Near La Vergne October 7. Repulse of Forest's attack on Edgefield November 5. Duty at Nashville till December 26. Advance on Murfreesboro December 26-30. Action at Nolensville, Knob Gap, December 26. Triune December 27-28. Battle of Stone's River December 30-31, 1862, and January 1-3, 1863. Duty at Murfreesboro till June. Expedition toward Columbia March 4-14. Middle Tennessee (or Tullahoma) Campaign June 24-July 7. Christiana June 24. Occupation of Middle Tennessee till August 16. Passage of Cumberland Mountains and Tennessee River and Chickamauga (Ga.) Campaign August 16-September 22. Battle of Chickamauga, (Ga.) September 19-20. Siege of Chattanooga, Tenn., September 24-November 23. Chattanooga-Ringgold Campaign November 23-27. Orchard Knob November 23-24. Mission Ridge November 25. March to relief of Knoxville and Campaign in East Tennessee November 28, 1863, to January 25, 1864. Operations about Dandridge January 16-17, 1864. At London, Tenn., till. April 18. Atlanta (Ga.) Campaign May to August, 1864. Demonstration on Rocky Faced Ridge May 8-11. Buzzard's Roost Gap May 8-9. Demonstration on Dalton May 9-13. Battle of Resaca May 14-15. Near Calhoun May 16. Adairsville May 17. Near Kingston May 18-19. Near Cassville May 19. Advance on Dallas May 23-25. Operations on line of Pumpkin Vine Creek and battles about Dallas, New Hope Church and Allatoona Hills May 25-June 5. Operations about Marietta and against Kenesaw Mountain June 10-July 2. pine Hill June 11-14. Lost Mountain June 15-17. Assault on Kenesaw June 27. Ruff's (or Neal Dow's) Station, Smyrna Camp Ground July 4. Chattahoochie River July 5-17, Buckhead Nancy's Creek July 18. Peach Tree Creek July 19-20. Siege of Atlanta July 22-August 25. Ordered to Springfield, Ill., August 25.
Mustered out September 20, 1864, expiration of term. Veterans and Recruits transferred to 9th Illinois Infantry.
Regiment lost during service 7 Officers and 96 Enlisted men killed and mortally wounded and 2 Officers and 83 Enlisted men by disease. Total 188.